Read at Medium
In the article by Suzanne Scacca for Smashing Magazine (2019), various entry point options are well outlined.
This option is preferable when the main focus has to be on the search functionality.
Placing the search icon in the Tab bar (Human Interface) or Navigation bar (Material guidelines) provides access to the search function from any screen of the application.
This option is suitable for applications where the search plays an important role in overall navigation.